let age = 25
console .log (age ==25)
console.log(age!=30)
console.log (age>20)
console.log(age ==="25")//类型
console.log(age !=="25")//类型
let score = "100"
let res = Number(score)
console.log(res)
let str = String(50)
console.log(str,typeof str)
let bo = Boolean(100)
console.log(bo,typeof bo)
console.log (10 +"5")//105
console.log(5=="5")//true
console.log(5==="5")//false
console.log(10>"5")//true
if(""){
    //false
}
if(0){
    //false
}